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Journal of Sedimentary Research, Section
B: Stratigraphy and Global Studies
Vol. 66 (1996)No.
6. (November), Pages 1156-1168
Synthetic Seismograms from Vibracores: A Case Study in Correlating the
Late Quaternary Seismic Stratigraphy of the New Jersey Inner Continental
Dominic Esker (1)(*), Robert E. Sheridan (1), Gall M.
Ashley (1), Jeffrey S. Waldner (2), David W. Hall (2)
A new technique, using empirical relationships between median grain size
and density and velocity to calculate proxy values for density and velocity,
avoids many of the problems associated with the use of well logs and shipboard
measurements to construct synthetic seismograms. This method was used to
groundtruth and correlate across both analog and digital shallow high-resolution
seismic data on the New Jersey shelf. Sampling dry vibracores to determine
median grain size eliminates the detrimental effects that coring disturbances
and preservation variables have on the sediment and water content of the
core. The link between seismic response to lithology and bed spacing is
more exact. The exact frequency of the field seismic data can be realistically
simulated by a 10-20 cm sampling in erval of the vibracores. The estimate
of the percentage error inherent in this technique, 12% for acoustic impedance
and 24% for reflection amplitude, is calculated to one standard deviation
and is within a reasonable limit for such a procedure.
The synthetic seismograms of two cores, 4-6 m long, were used to correlate
specific sedimentary deposits to specific seismic reflection responses.
Because this technique is applicable to unconsolidated sediments, it is
ideal for upper Pleistocene and Holocene strata.
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